Changes in Senna obstuifolia Germination Requirements over 12 Months under Field Conditions
Senna obtusifolia seeds were collected in Fall 2003 and immediately field sown to assess dormancy alleviation and effect of after-ripening over a 12-month period on light and temperature requirements for g...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2009-01-01
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| Series: | International Journal of Agronomy |
| Online Access: | http://dx.doi.org/10.1155/2009/935205 |
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| Summary: | Senna
obtusifolia seeds were collected in
Fall 2003 and immediately field sown to assess
dormancy alleviation and effect of
after-ripening over a 12-month period on light
and temperature requirements for germination.
Seeds did not exhibit physical dormancy at
maturation and readily germinated over a broad
range of light and thermal conditions. Dormancy
gradually increased during Winter months,
resulting in only a small fraction of the
population capable of germination by early
Spring. Dormancy break did not occur at a
specific time of the year nor did dormancy
alleviation increase over the 12-month period
following maturation. Conditions during Spring
and Summer coincided with thermal requirements
for germination of the nondormant fraction of
the population. Senna
obtusifolia seeds were nonresponsive to
red and far-red lights, and seeds did not acquire
a light requirement following burial for 6
months. |
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| ISSN: | 1687-8159 1687-8167 |